{"id":"CVE-2026-18140","sourceIdentifier":"ff89ba41-3aa1-4d27-914a-91399e9639e5","published":"2026-07-30T19:17:26.457","lastModified":"2026-10-23T22:10:00.160","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"Uncontrolled recursion in the unknown-key skip path of the aws-smithy-json runtime crate before 0.62.7, which the smithy-rs code generator invokes from every generated struct deserializer, might allow remote unauthenticated users to cause a denial of service (process abort via stack exhaustion) via a single small HTTP request containing deeply nested JSON to a smithy-rs generated server.\n\n\n\nTo remediate this issue, users should upgrade to aws-smithy-json 0.62.7 or later and rebuild."},{"lang":"es","value":"Recursión incontrolada en la ruta de omisión de clave desconocida del crate de tiempo de ejecución aws-smithy-json anterior a 0.62.7, que el generador de código smithy-rs invoca desde cada deserializador de estructura generado, podría permitir a usuarios remotos no autenticados causar una denegación de servicio (aborto de proceso por agotamiento de pila) a través de una única pequeña solicitud HTTP que contiene JSON profundamente anidado a un servidor generado por smithy-rs.\n\nPara remediar este problema, los usuarios deberían actualizar a aws-smithy-json 0.62.7 o posterior y reconstruir."}],"affected":[{"source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","affectedData":[{"vendor":"AWS","product":"aws-smithy-json","defaultStatus":"unaffected","versions":[{"version":"0.32.0","lessThanOrEqual":"0.62.6","versionType":"custom","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","baseScore":8.7,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"cvssMetricV31":[{"source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-30T19:12:34.733029Z","id":"CVE-2026-18140","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","type":"Secondary","description":[{"lang":"en","value":"CWE-674"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:amazon:aws-smithy-json:*:*:*:*:*:rust:*:*","versionEndExcluding":"0.62.7","matchCriteriaId":"BDC78F08-F0CF-4631-931C-7C24AB4257FC"}]}]}],"references":[{"url":"https://aws.amazon.com/security/security-bulletins/2026-067-aws/","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","tags":["Vendor Advisory"]},{"url":"https://crates.io/crates/aws-smithy-json/0.62.7","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","tags":["Product"]},{"url":"https://github.com/smithy-lang/smithy-rs/security/advisories/GHSA-8ffr-xgwf-xj56","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","tags":["Vendor Advisory"]}]}